Business Halacha: I Got My Competitor’s Customer Base


cell-phoneQuestion: I obtained access to the customer base of my competitor. Can I run a telemarketing campaign aimed directly at his clients?

Answer: We mentioned last week that it is usually not possible to restrain someone from opening a competing store, since each store operates independently. However, it is problematic to target another person’s client base. Since the person invested effort and resources to establish this client base and has specific expectations to maintain their business, such marketing encroaches on his rights (Tosfos Kiddushin 59a).

Established clients are known in halacha as “ma’arufya.” The Rama cites two opinions and practices as to whether a person can restrict others from encroaching upon his established clients and dealing with them (C.M. 156:5). This restriction applies both to non-Jewish clients and, in a more significant way, to Jewish clients.

However, if you open a competing store and advertise publicly, you can serve also the competitor’s clients who come of their own accord (Chasam Sofer C.M. #175). It is also permitted for you to provide promotional incentives, discounts and bonuses, since the other store can do the same (C.M. 228:18).

Authored by Rabbi Meir Orlian

These articles are for learning purposes only and cannot be used for final halachic decision. The Business Halacha email is a project of Business Halacha Institute ( and is under the auspices of Rav Chaim Kohn.

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  1. Time was, shomrei Shabbos businessmen were mechazek each other to the extent that family lore has it that my grandfather took over and maintained a competitor’s business half a century ago when he left the country for a few months.

    I have to admit, there wasn’t much of a financial yerusha…